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Income Taxes (Effective Tax Rate Reconciliation) (Details)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Income Tax Disclosure [Abstract]      
U.S. federal statutory tax rate 21.00% 21.00% 21.00%
State taxes, net of federal benefit 0.90% 0.60% 1.00%
Income from equity affiliates (2.50%) (2.30%) (2.00%)
Foreign tax differentials 0.50% 0.10% 1.00%
Tax on foreign repatriated earnings 0.70% 0.90% 0.10%
Share-based compensation (0.70%) (0.80%) (0.60%)
Tax reform repatriation 0 0 0.019
Other (1.40%) 0.20% (1.40%)
Effective Tax Rate 18.50% 19.70% 21.00%